Abstract: A preferred embodiment of an antenna for radiating and collecting electromagnetic radiation includes a substantially planar conductive member having a first side and a second side. A strip conductor is positioned to the first side of the conductive member and substantially parallel thereto. A dielectric material is sandwiched between the strip conductor and the conductive member. A length of wire for radiating and collecting microwave electromagnetic radiation has a first end and a second end and lies substantially in a plane which is positioned to the second side of the conductive member and substantially parallel thereto. The length of wire is spaced apart a distance from the conductive member. A feed probe wire couples the first end of the length of wire to the strip conductor. The feed probe wire extends through the conductive member and through the dielectric material. A shorting wire couples the second end of the length of wire to the conductive member.

Abstract: A microwave intrusion detection system having a transceiver positioned to one side of a substantially conductive member and an antenna positioned on the other side of the conductive member. The antenna shares the conductive member with the transceiver by utilizing the conductive member as a reflective surface. A transmission line is included which has a strip conductor positioned to the one side of the conductive member and a dielectric material therebetween. An antenna has a substantially planar conductive member, a strip conductor positioned to one side of the conductive member, and a dielectric material sandwiched therebetween. A length of wire lies in a plane which is positioned to a second side of the conductive member and is spaced apart a distance from the conductive member. A feed probe wire couples one end of the length of wire to the strip conductor and extends through the conductive member and through the dielectric material.